I think we need to agree on a few things first:
Q1 - How many spies do we want?
We have 1 right now, it is 1 tile north of Tolosa. We can have another, for backup, it will take Production 2 turns. I vote YES.
Q2 - Should we build Colossus?
Since I support Astro beeline, I will have to say NO.
Q3 - Where should our existing settler go?
Desert island vs Clams/Sugar (probably the desert tile) area? Clams/Sugar seems sub-optimal, it is a long way from Paris but does not have the +2 trade routes, it will cost us too much IMO.
My vote is for desert island first.
Q4 - How many settlers should we be building in the near future and where to settle them?
I like Commerce for the next settler, as nothing else is super urgent. The Clams/Sugar spot if no more island spots have multiple resources.
Q5 - How many more workers do we need?
I think just 1, in Clams, to be built immediately.
City Build Compromises
Paris - build a forge first,

Production - spy, trireme, workboat/worker, barracks??
Clams - worker, forge
Production is obviously the wildcard in any build plan, it's just so tempting to get it to build what we want. Enough of the team have expressed the desire to build another spy I think, and if we do it, it should be first. Same for the trireme, which can go second due to the less time critical nature of it. Then a WB or worker as the situation requires. A barracks is an excellent filler, as we will definitely need it sooner or later, especially if Brennus DoW's us.
Worker Compromises
Maybe send workers 3 & 4 to the Gems immediately after finishing the mine
Beg
Assuming Brennus is happy with the trade, the shared resources and shared civics when we get Currency, we could/should do a beg. It depends on how much wealth he has, as the beg points take quite a while to accumulate, and we don't want to waste them.